File: issue-67039-unsound-pin-partialeq.rs

package info (click to toggle)
rustc 1.85.0%2Bdfsg3-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental, sid, trixie
  • size: 893,396 kB
  • sloc: xml: 158,127; python: 35,830; javascript: 19,497; cpp: 19,002; sh: 17,245; ansic: 13,127; asm: 4,376; makefile: 1,051; perl: 29; lisp: 29; ruby: 19; sql: 11
file content (27 lines) | stat: -rw-r--r-- 617 bytes parent folder | download | duplicates (15)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
// Pin's PartialEq implementation allowed to access the pointer allowing for
// unsoundness by using Rc::get_mut to move value within Rc.
// See https://internals.rust-lang.org/t/unsoundness-in-pin/11311/73 for more details.

use std::ops::Deref;
use std::pin::Pin;
use std::rc::Rc;

struct Apple;

impl Deref for Apple {
    type Target = Apple;
    fn deref(&self) -> &Apple {
        &Apple
    }
}

impl PartialEq<Rc<Apple>> for Apple {
    fn eq(&self, _rc: &Rc<Apple>) -> bool {
        unreachable!()
    }
}

fn main() {
    let _ = Pin::new(Apple) == Rc::pin(Apple);
    //~^ ERROR type mismatch resolving
}